RANDOMISED DOUBLE BLIND 12-MONTH STUDY OF PREGABALINE FOR PATIENTS WITH RESTLESS LEGS

1. Diagnosis of RLS is to be made by a Physician with experience and/or training in RLS. Idiopathic RLS with the presence of all four clinical manifestations of
RLS:
• Urge to move the legs usually with dysesthesias: An urge to move the legs usually accompanied or caused by uncomfortable and unpleasant sensations in the legs. (Sometimes the urge to move is present without the uncomfortable ensations and sometimes the arms or other body parts are involved in addition to the legs);
• Onset or exacerbation with rest: The urge to move or unpleasant sensations begin or worsen during periods of rest or inactivity such as lying or sitting;
• Relief with movement: The urge to move or unpleasant sensations are partially or totally relieved by movements, such as walking or stretching, at least as long as the activity continues;
• Circadian pattern: The urge to move or unpleasant sensations are worse in the evening or night than during the day or only occur in the evening or night (when symptoms are very severe, the worsening at night may not be noticeable but must have been previously present);
• The following instruments will be utilized to aid the diagnosis:
• Medical history and/or RLS treatment history.
• Cambridge-Hopkins Restless Legs Syndrome Short Form Diagnostic Questionnaire (RLS-SFDQ-9) - entered by the subjects.
• RLS-Clinical Diagnostic Interview (RLS CDI) - conducted and signed-off by the Investigator.
2. RLS symptoms must occur predominantly in the evening (between the hours of 17:00 to 07:00).
3. A history or the presence of RLS symptoms for at least 6 months.
4. An International Restless Leg Scale (IRLS) total score >=15 at beginning of placebo run-in (1 week prior to Baseline) and end of placebo run-in (Baseline).
5. Have >=15 nights with RLS symptoms in the month prior to Screening. Subjects receiving RLS therapy at the time of Screening are to have had >=15 nights per
month with RLS symptoms prior to initiation of this treatment. Have >=2 nights with RLS symptoms during the week of placebo run-in.
6. Both genders. Age 18 years or older.
7. Evidence of a personally signed and dated Informed Consent Document indicating that the subject (or a legally acceptable representative) has been informed of all pertinent aspects of the trial.
8. Willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other trial procedures

Subjects may not participate in the study if they meet any of the following criteria:
1. Any secondary form of RLS which is primarily attributable to other conditions, eg, end stage renal disease, iron-deficiency anemia.
2. Current augmentation due to RLS treatment, or pramipexole-caused clinically significant augmentation within 6 weeks of the Screening Visit. Clinically significant augmentation is defined as the subject experiences symptoms that are severe enough to impact the subject*s daily life and/or requires an alteration of treatment, eg, change to another class of medication.
3. Requiring regular (more than 2 times a week within 3 months of screening visit) medication treatment for daytime RLS symptoms (between the hours of 07:00
to 17:00).
4. Placebo responders as defined by a >50% improvement in RLS symptoms, ie, decrease of the total score in IRLS Scale between beginning of placebo run in (1 week prior to Baseline) and end of placebo run-in (Baseline Visits).
5. Any symptomatic neuropathies or current diagnosis of clinically relevant concomitant conditions that may confound clinical assessments of RLS and/or severe
enough to disturb sleep, for example, painful leg and moving toes syndrome.
6. Clinically significant lumbar radiculopathy or central spinal stenosis by history or examination.
7. Presence of severe central nervous degenerative diseases such as Parkinson*s disease, dementia, progressive supranuclear paresthesia, multisystem atrophy, Huntington Chorea, amyotrophic lateral sclerosis, or Alzheimer*s disease.
8. History or presence of a severe sleep disorder, especially those with difficulty falling and/or staying asleep, that may confound assessments (Apnea/Hypopnea Index greater than 20 if a sleep study has been previously performed) at the Screening or Baseline Visits.
9. Use of medications likely to influence sleep architecture or motor manifestations during sleep prior to the Baseline Visit (BL) without an appropriate washout period. Refer to Appendix 1 for the list of exclusionary medications. These include neuroleptics, hypnotics, sedatives, antidepressants, anxiolytics, anticonvulsants, psychostimulantmedications, barbiturates and opioids. 10. Clinically significant liver disease, or an elevation in either bilirubin, aspartate aminotransferase (ASAT),
or alanine aminotransferase (ALAT) levels >3 times the upper limit of normal value (ULN).
11. Clinically significant renal disease, or creatinine clearance level <60 mL/min esttimated by Cockroft Gault method).
12. Any other clinically significant condition (eg, cardiac dysfunction, active neoplasm, uncorrected hypothyroidism or hyperthyroidism) or laboratory assay abnormality.
13. Failure to respond positively to dopaminergic agents, gabapentin or pregabalin in treating RLS according to medical history. 14. Known hypersensitivity to any components of the trial medication or similar drugs.
15. Serum ferritin below 15µg/L.
16. Employment hours disruptive to the normal circadian sleep wake cycle such as nighttime or variable rotating shifts.
17. Suicide risk (life time) by medical history and by assessment using C-SSRS. If the subject responds *yes* to any of the C-SSRS questions and yet the subject is allowed to participate in the trial, a risk assessment narrative must be constructed by the Investigator.
18. Pregnant or lactating women, or women with child bearing potential who are not surgically sterile, two years postmenopausal, or do not practice two combined methods of medically acceptable forms of contraception.
19. Participating in other investigational drug studies or having received other investigational drugs within the previous 30 days of the Screen Visit.
20. Current or history of chronic alcohol or drug abuse within the past 12 months.